Studies On Treatment Technology And Processing Of The Anaerobic Dispersed Swine Wastewater In Rural

This paper mainly studies the digestion treatment process of livestock and poultry manure anaerobic in rural areas.The COD_Cr,NH_3-N,TN,TP′s concentration is high,and the chroma is large in the anaerobic digestion liquid,and it is difficult to reach the effluent standard through the conventional treatment.Put forward the “Fenton oxidation + break point chlorination” combined process to treatment the anaerobic digestion liquid of poultry waste in rural areas.Inspect the treatment performance to COD_Cr、NH_3-N、TN、TP and chroma by the combined process.Comprehensive use the single factor test and orthogonal test,Analysis the influence factors of Fenton oxidation reaction and the break point chlorination.Through orthogonal test,get the optimum reaction parameters.The main conclusions of this paper are summarized as follows:（1）In this experiment,the treatment of anaerobic digestion by “Fenton oxidation + reaction point chlorination” combine process,and the effluent quality can meet the requirement of 《water quality standard for livestock and poultry breeding》（GB18596-2001）.（2）In Fenton oxidation reaction,There are four main influence factors: 30%H₂O₂ dosage,Fe²⁺ catalyst dosage,pH,reaction time.Through single factor test,the reaction conditions were:0.065g/250ml(0.052 g Fe²⁺ catalyst dosage/100 mg COD_Cr)、 0.02ml/250ml(0.017 ml 30%H₂O₂ dosage/100 mg COD_Cr)、 4（pH）、60min（reaction time）,The removal rate of COD_Cr was more than 70%,⁸0%,The removal rate of TP was 50%⁸0%,but the removal rate of NH_3-N and TN was not obvious.According to the data provided by orthogonal experiment.Test shows: the influence of various factors on the removal rate of COD_Crwas Fe²⁺ catalyst dosage > pH> 30%H₂O₂ dosage> reaction time.According to the data provided by orthogonal experiment : the best reaction condition is that the oxidant is 0.02ml/250ml(0.017 ml 30%H₂O₂dosage/100 mg COD_Cr),the dosage of the catalyst is 0.065g/250ml(0.052 g Fe²⁺ catalyst dosage/100 mg COD_Cr),4（pH）,and the reaction time is 60 min.（3）In break point chlorination,the influence factors were selected as reaction time,Cl/NH₄⁺（m/m）adding ration,pH,and the reaction temperature.Through single factor test,the reaction conditons were: 11:1（Cl/NH₄⁺（m/m）adding ration）、30min（reaction time）、7.0（pH）、and under normal temperature condition,the removal effect is best,the removal rate of NH_3-N、TN、TP can reach 99%、95%、99%.According to the data provided by orthogonal experiment.Test shows: the influence of various factors on the removal rate NH_3-N was Cl/NH₄⁺（m/m）adding ration>reaction time >pH.: the best reaction condition is that pH is about 7,Cl/NH₄⁺（m/m）adding ration is 11:1,reaction time is 25 min.（4）In this experiment,the water samples was biogas slurry from a farm in Jinxian Country,Jiangxi Province,The wastewater quality,the pH was 7⁷.6,the COD_Cr was 445⁶25mg/L,NH_3-N was 200⁵50mg/L,TP was 62¹00mg/L,TN was 220⁵80mg/L.Through the experiment,Under the optimum reaction conditions by Fenton,the removal rate of COD_Cr was 77%,and the effluent concentration was 102¹43mg/L;the removal rate of TP was 68%,and the effluent concentration was 19³2mg/L.Under the optimum reaction conditions by break point chlorination reaction,the removal rate of NH_3-N was 99%,and the effluent concentration was 2⁵.6mg/L;the removal rate of TN was 95%,and the effluent concentration was 11²5mg/L;the removal rate of TP was 99%,and the effluent concentration was 0.2⁰.32mg/L.and the effluent quality can meet the requirement of 《 water quality standard for livestock and poultry breeding 》（GB18596-2001）.